Edit's w to a file changed on disk since read is refused once, as Save is (w again to overwrite), the rest of an X/'/w written and the refused named; Edit filters get a pane command's environment ($PARDES_MOUNT, $PARDES_9P, $PARDES_PID, $winid); an Edit with no commands runs beside one whose commands run unless it touches a file that one changes, refused busy (EBUSY) as is a second Edit with commands

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 13 insertions, 3 deletions

diff --git a/src/9p_io.zig b/src/9p_io.zig
index a01eb491..18c51ece 100644
--- a/src/9p_io.zig
+++ b/src/9p_io.zig
@@ -1992,6 +1992,16 @@ pub fn start(io: std.Io, gpa: std.mem.Allocator, core: *pardes.Pardes) ?*Listene
 /// open to scripts and to mounted shells — while withholding `PARDES_PID`,
 /// which is the whole of what `--nested` means.
 pub fn exportPaneEnv(listener: ?*const Listener, serial: u32, adopts: bool) void {
+    exportEnv(if (listener) |l| l.path() else null, serial, adopts);
+}
+
+/// exportPaneEnv for a command run off the loop (an Edit's filter), with
+/// this process's own socket: what a pane's command would be given.
+pub fn exportSessionEnv(serial: u32, adopts: bool) void {
+    exportEnv(if (own_socket_len > 0) own_socket[0..own_socket_len] else null, serial, adopts);
+}
+
+fn exportEnv(socket: ?[]const u8, serial: u32, adopts: bool) void {
     var announced = false;
     if (adopts) announcing: {
         var buf: [16]u8 = undefined;
@@ -2001,13 +2011,13 @@ pub fn exportPaneEnv(listener: ?*const Listener, serial: u32, adopts: bool) void
     }
     if (!announced) _ = unsetenv("PARDES_PID");
 
-    if (listener) |l| exporting: {
+    if (socket) |own| exporting: {
         var sock: [sun_path_len]u8 = undefined;
-        const path = std.fmt.bufPrintSentinel(&sock, "{s}", .{l.path()}, 0) catch break :exporting;
+        const path = std.fmt.bufPrintSentinel(&sock, "{s}", .{own}, 0) catch break :exporting;
         var buf: [16]u8 = undefined;
         const id = std.fmt.bufPrintSentinel(&buf, "{d}", .{serial}, 0) catch break :exporting;
         if (setenv("PARDES_9P", path, 1) != 0) break :exporting;
-        exportMount(l.path());
+        exportMount(own);
         if (setenv("PARDES_PANE", id, 1) == 0) return;
     }
     _ = unsetenv("PARDES_9P");